Return the query as a container of parameters
This function returns a bidirectional view of key/value pairs over the query. The returned view references the same underlying character buffer; ownership is not transferred. Any percent-escapes in strings returned when iterating the view are decoded first.
params_view pv = url_view( "/sql?id=42&name=jane%2Ddoe&page+size=20" ).params();
query = *( pchar / "/" / "?" )
query-param = key [ "=" value ]
query-params = [ query-param ] *( "&" query-param )
encoded_params , encoded_query , has_query , query .